US4505044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drawing aid with interchangeable insert
Assignee: Individual
•
Filing: 1983-09-12
•
Granted: 1985-03-19
•
Expires: 2003-09-12
Abstract
Abstract A drawing aid having a sandwich-like structure in which the middle layer is an interchangeable pattern insert. The insert is interchangeable with other inserts, each insert having a particular pattern. The interchangeability of the insert enables the drawing of different lines, shapes, letters, etc. using the same template housing. A particularly useful embodiment allows one to draw a line over the insert pattern, producing broken lines without lifting the drawing tool.
Inventors
- 👤 Nader Shafii-Rad-G.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:31
CPC Classifications
B; B43; B43L; B43L13/00; B43L13/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
57 words
A drawing aid for drawing broken lines without lifting a drawing tool comprising: (a) an interchangeable pattern insert between 0.1-1.0 mm thick comprising regularly spaced triangles; and (b) means for supporting said pattern insert wherein said pattern insert and said supporting means form a three-layer structure such that the bottom layer is thinner than the top layer.
Claim 2
Dependent Claim
57 words
A drawing aid for drawing broken lines without lifting a drawing tool comprising: (a) an interchangeable pattern insert between 0.1-1.0 mm thick comprising regularly spaced triangles; and (b) means for supporting said pattern insert wherein said pattern insert and said supporting means form a three-layer structure such that the bottom layer is thinner than the top layer.
Claim 3
Dependent Claim
28 words
A drawing aid for drawing broken lines without lifting a drawing tool as described in claim 1 wherein said regularly spaced triangles alternate with regularly spaced isosceles trapezoids.
Claim 4
Dependent Claim
28 words
A drawing aid for drawing broken lines without lifting a a drawing tool as described in claim 1 or 2 wherein said bottom layer is 0.1-1.5 mm thick.
References Cited (Backward Citations)
US1105810A
Cited
DE415071C
Cited
US2303676A
Cited
US2444860A
Cited
US2543714A
Cited
US2605550A
Cited
US2604702A
Cited
US2909843A
Cited
FR1288209A
Cited
US3584385A
Cited
US3665612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-18 | 1988-09-17 | 1989-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-18 | 1992-09-17 | 1993-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-18 | 1996-09-17 | 1997-03-19 | $7700.00 | Window Closed / Lapsed |